\begin{table}[!htb]\centering         \def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}         \caption{Construction expenditure and new lane miles\label{tab:table4}}         \setlength{\tabcolsep}{3pt}         \begin{tabular}{l*{5}{c}}         \hline\hline
                &\multicolumn{1}{c}{(1)}         &\multicolumn{1}{c}{(2)}         &\multicolumn{1}{c}{(3)}         &\multicolumn{1}{c}{(4)}         \\
\hline
\(I^{L}_{st} \) &   0.0472\sym{*}  &  -0.0008         &   0.1135\sym{**} &   0.0512         \\
                & (0.0230)         & (0.0134)         & (0.0328)         & (0.0363)         \\
\(t\)           &                  &                  &  -0.6487\sym{*}  &  -0.4112         \\
                &                  &                  & (0.2910)         & (0.3119)         \\
\(I^{L}_{st} t \)  &                  &                  &  -0.0045\sym{***}&  -0.0018         \\
                &                  &                  & (0.0012)         & (0.0022)         \\
\cline{2-5}State FE        &       No         &      Yes         &       No         &       No         \\
\hline
N               &    1,171         &    1,171         &    1,171         &      808         \\
\(F\)           &                  &                  &                  &                  \\
\hline\hline         \multicolumn{5}{l}{\footnotesize Standard errors clustered by state in parenthesis.  }\\         \multicolumn{5}{l}{\footnotesize \sym{+} \(p<0.10\), \sym{*} \(p<0.05\), \sym{**} \(p<0.01\), \sym{***} \(p<0.001\).   }         \end{tabular}\end{table}
